题目

按要求写出下列反应的化学方程式：（1）二氧化碳使澄清石灰水变浑浊：_____。（2）一氧化碳还原赤铁矿石（主要成分为氧化铁）：_____。（3）过氧化氢溶液以二氧化锰为催化剂分解产生氧气：_____。（4）纯碱放入稀盐酸中：_____。 答案：【答案】CO2＋Ca(OH)2=CaCO3↓＋H2O Fe2O3＋3CO 2Fe＋3CO2 2H2O22H2O+O2↑ Na2CO3+2HCl=2NaCl＋H2O＋CO2↑ 【解析】（1）二氧化碳使澄清石灰水变浑浊：CO2＋Ca(OH)2=CaCO3↓＋H2O （2）一氧化碳还原赤铁矿石（主要成分为氧化铁）：Fe2O3＋3CO 2Fe＋3CO2（3）过氧化氢溶液以二氧化锰为催化剂分解产生氧气：2H2O22H2O+O2↑（4）纯碱放 If you are looking for a summer camp job opportunity, the following are some summer camp jobs available for 2010 summer. 1. Fishing / Fly-fishing Male 21+. Teach fishing and fly-fishing (用假蝇钓鱼) techniques. Live with 6-8 campers, teach basic outdoor skills, lead backpacking trips and assist with canoe trips. Salary: $2,400.00-$3,000.00 Roaring Brook Camp for Boys 480 Roaring Brook Road Bradford, Vermont 05033, USA Contact: Dr. Candice Raines at (800) 802-747-0282 2. Athletic Trainer International Sports Training Camp is a specialized sports camp located on a private 100-acre lake in the scenic Pocono Mountains of Northeastern Pennsylvania. We are famous for our outstanding facilities, innovative (创新的) programs and friendly staff. We are looking for both students and certified athletic trainers. Salary: $2,500.00 International Sports Training Camp. 1100 Twin Lake Road Stroudsburg, Pennsylvania 18360, USA Contact: Kara Klaus at (570) 6202267 3. Head Cook Manage kitchen staff of 4, order food and prepare meals and snacks for 50-60 campers and staff daily during sessions and training periods. Salary: $3, 000.00-$4,000.00 Burgundy Center for Wildlife Studies HC 83, Box 38DD Capon Bridge, West Virginia 26711, USA Contact: Vini Schoene at (540) 465-1516 4. Drama Department Head Camp Airy (for boys) is seeking an experienced individual with a theater background and experience in directing children’s productions. Supervise counselor staff and direct two major productions in our 600-seat Outdoor Theatre. Our summer season runs from June 17 to August 18. Be sure to visit our outstanding website at www.airylouise.org. Salary: Depends on Experience. Camp Airy & Camp Louise 14938 Old Camp Airy Road Thurmont, Maryland 21788, USA Contact: Steve Goldklang at (410) 466-9010 1. Who would be most interested in the passage? A. College teachers.      B. Online bloggers.     C.Holiday-goers.      D. Job seekers. 2. Mr. Smith is good at fishing and he plans to spend the summer doing what he loves and earn some money. Which number should he dial? A. (570) 6202267.        B. (540) 465-1516. C. (800) 802-717-0282.       D. (410) 466-9010. 3. Which of the following statements about Athletic Trainer is TRUE? A. College graduates are preferred.       B. Only professional athletes can apply. C.This position offers a monthly salary of $3,500. D. Applicants can get in touch with Kara Klaus. 4. Which of the following organizations offers a salary depending on experience? A. Camp Airy & Camp Louise.       B. International Sports Training Camp. C.Roaring Brook Camp for Boys.       D. Burgundy Center for Wildlife Studies.